1. flying or radiating from a center.   eugenic   dyspeptic   centrifugal   diffuse   Hint Half-n-half Clue   2. not conventional.   discrete   heterodox   ductile   feasible   Half-n-half Clue   3. of motive force or energetic.   dynamic   horticultural   combustible   ebullient   Half-n-half Clue   4. cancer-causing.   hypothetical   carcinogenic   chronic   inductive   Half-n-half Clue   5. pertaining to the back (of an animal).   integral   concave   dorsal   inverse   Half-n-half Clue   6. two-year long or every two years.   immune   empirical   analgesic   biennial   Half-n-half Clue   7. opposite or inverted in relation or order.   graduated   impervious   corrosive   inverse   Half-n-half Clue